Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16e9d3eef3e3f8e…

MALICIOUS

PDF

88.7 KB Created: 2021-03-25 06:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f865a21d8ec4bc3666746a626fb4c0e SHA-1: ed6bb9e269dfd87b99bfe5e16c247df923ac7c25 SHA-256: a16e9d3eef3e3f8e9b4496191224b5f55ed663f53748da181ec025b150313b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://pelibifir.ru/strik?utm_term=is+warcraft+3+reforged+out', is flagged as suspicious. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=is+warcraft+3+reforged+out
    • https://cdn.sqhk.co/vasegodesazu/czpgcji/nakiwaneloxesafigumiwevi.pdf
    • https://cdn.sqhk.co/madosodu/f5ia0jV/tik_tok_videos_on_youtube_faisu.pdf
    • https://cdn.sqhk.co/jeforije/p8mijgd/ring_a_bell_idiom_sentence.pdf
    • https://cdn-cms.f-static.net/uploads/4481423/normal_600a2249f0768.pdf
    • https://static.s123-cdn-static.com/uploads/4422150/normal_6008eaadd6c86.pdf
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5ff77a5fc14f5.pdf
    • https://cdn-cms.f-static.net/uploads/4456389/normal_604a1762a7010.pdf
    • https://cdn.sqhk.co/xiselaza/XqW9Sij/sefulivananasen.pdf
    • https://cdn-cms.f-static.net/uploads/4479474/normal_60220c3e00ffb.pdf
    • https://cdn.sqhk.co/xedaberetaj/4gggcPq/busch_wildlife_fishing_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b9a77f53-cac9-4516-9bb7-76a46ed6f37b/estudios_biblicos_adventistas_la_fe_de_jesus.pdf
    • https://uploads.strikinglycdn.com/files/875d59cf-25e5-4736-8be5-f5547bac5093/what_is_the_moral_message_of_animal_farm.pdf
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_3aaded6c3b72406992856a2699182c2e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd904d1e-f0b3-46e2-95e7-bffc43b5cb08/fewodafowefuput.pdf
    • https://uploads.strikinglycdn.com/files/dd953bd2-233e-4cd3-a6b4-0795d67b25ba/96451718097.pdf
    • https://uploads.strikinglycdn.com/files/a12052e1-c999-46c8-b048-3e9ac9d7a368/gupetojofu.pdf
    • https://uploads.strikinglycdn.com/files/b897dfc5-cccf-448b-b7ba-fcccacb4272f/commuter_benefits_card_balance.pdf
    • https://uploads.strikinglycdn.com/files/6d1b17a9-fb1d-4ee2-8abb-bd4644675c94/zadiwelatagifubobipefi.pdf
    • https://uploads.strikinglycdn.com/files/3e40a06d-1b3f-434a-a186-e522942b09c5/50186198831.pdf
    • https://uploads.strikinglycdn.com/files/8caef56b-ce82-461c-b2c3-5c2260a06fac/50649087617.pdf
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_36975bd87a054e9d98986417a3ced21a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d7a.bin
f9e16f1bc45e27ddfb6c9bfaeba47c0e17e7edf7c8fd9ec176bf8265443ba2e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 5348 bytes
font_01_sfnt_off00012fca.bin
a5c4272afb53e466162a751153bea3f79078f67a4a0ff2898d2860419f33e42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 11028 bytes

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